KR101876675B1 - Digital power testers for distribution and distribution board - Google Patents

Abstract

The present invention discloses a digital power meter for a distribution board and a panel board. The digital power meter for a distribution board and a panel board of the present invention comprises: a converter/transformer for measuring an amount of power of a power system; a memory unit for storing the amount of power measured in the converter/transformer and a preset operating parameter; and a micro control unit (MCU) for controlling a detecting operation of the converter/transformer based on the operation parameter and recording the detected amount of power in the memory unit, wherein the MCU monitors an operation power supplied from a power supply unit to the memory unit, and when the operation power supplied to the memory unit is greater than a preset reference value, the MCU is switched to an enable status. The MCU and the memories configured in the digital power meter can be started or stopped each other at the same time, thereby obtaining the effect of preventing malfunction and providing the integrity.

Description

Technical Field [0001] The present invention relates to a digital power meter for a switchboard and a distribution board,

The present invention relates to a digital power meter configured in a distribution board or an electrical switchboard. More particularly, the present invention relates to a digital power meter in which a micro control unit and memories configured in a digital power meter can start or stop operations at the same time, And to a digital power meter for a distribution board and a distribution board.

Generally, power distribution devices such as switchgear, switchgear, and distribution panel are power supply devices that convert high-voltage electric power to low voltage according to the consumption system and supply electric power to apartments, buildings, schools, factories, ports and so on. Capacity.

The distribution board, the switchboard, the switchboard, etc., including the optimum operation controller and the power monitoring controller, are manufactured as a single high voltage integral type having a multi-layered structure for preventing the entry of moisture and foreign matter from the outside and making it easy to install.

A digital power meter is mainly used as a power monitoring controller of such a switchboard or a switchboard facility. The digital power meter measures the voltage and current of the power system by using a microcontroller unit (MCU) or the like, calculates and displays various electric quantities including the electric power.

The power monitor controller further includes a nonvolatile memory such as an EEPROM to store the measured power amount and various operation parameters. In order for the power monitor controller to operate without errors, the MCU and the memory must be smoothly connected.

However, in the conventional power monitoring controller, the operation power is different between the MCU and the memory, and errors are frequently generated in the process of repeating the power failure and the power failure. Specifically, since the power consumption of the MCU is less than about 2 V, and the operating power of the memory is about 3 V or more, the data exchange between the MCU and the memory may occur Respectively.

For example, in the case of recovery of the operating power, the MCU may first be operated in a low voltage state and then the memory may start to operate. Conversely, in the case of a power failure, the memory is stopped first, . If the starting and stopping points are different from each other, the access point between the MCU and the memory becomes unstable, and the read and write operations are also not accurate, thus failing to guarantee the integrity.

It is also proposed that a voltage detector, a comparator, a switch controller, and the like are additionally provided to detect and compare the operating power of each of the MCU and the memory, and to operate them simultaneously when the operating power becomes equal to each other. However, as the number of separate components increases, the cost and volume of the installation increase, and the efficiency of the system is further degraded due to the addition of management elements.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a digital power meter, And to provide a digital power meter for a distribution board and a distribution board capable of providing integrity.

According to an aspect of the present invention, there is provided a digital power meter including a current transformer for measuring an amount of power in a power system, a memory unit for storing an amount of power measured in the current transformer / Wherein the MCU monitors the operation power supplied from the power supply unit to the memory unit, and when the operation power supplied to the memory unit is equal to or greater than a preset reference value, the MCU monitors the operation power supplied from the power supply unit to the memory unit, , And is switched to the enabled state.

In particular, the MCU of the present invention includes an analog-to-digital converter for simultaneously receiving an operation power supplied to a memory unit and converting a voltage of the operation power supply to a digital signal, a digital-to- An operation power source confirmation unit for generating and outputting an enable signal when the enable signal is generated, and when the enable signal is generated, the operation parameter is read from the memory unit to control the detection operation of the resistance / And a measurement recording unit.

The digital power meter for the switchboard and the distribution board according to the embodiment of the present invention having various technical features as described above can be operated at the same point in time even if the operation power of the micro control unit and the memories constituted in the digital power meter are different from each other only with minimal structural change So that the operation can be started or stopped.

In particular, even if another memory having different operation power is applied and installed, since the operation parameter is read to control the detection operation of the current transformer / transformer, it can be easily used without any problem reflecting the changes to the memory. The efficiency can be further improved by allowing the micro control unit and the memories to start or stop at the same time by minimizing the structure change without adding additional components.

In addition, even when the operation power of the micro control unit and the memories are different from each other, operation can be started or stopped at the same time, thereby preventing an operation error, providing integrity, and improving reliability.

FIG. 1 is a configuration diagram showing a configuration of installing an electric distribution panel in a power system according to an embodiment of the present invention.
FIG. 2 is a configuration diagram specifically showing the digital power meter of FIG. 1 according to the first embodiment.
FIG. 3 is a configuration diagram specifically illustrating an operation power supply structure of the MCU, the memory unit, and the power supply unit shown in FIG.
FIG. 4 is a graph for explaining an operation power source confirmation driving method of the operation power source confirmation unit shown in FIG. 3;
FIG. 5 is a configuration diagram specifically showing the configuration of the MCU, the memory unit, the power supply unit, and the operation power supply structure according to the second embodiment.
6 is a graph for explaining an operation power source confirmation driving method of the operation power source confirmation unit shown in FIG.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram showing a configuration of installing an electric distribution panel in a power system according to an embodiment of the present invention.

As shown in Fig. 1, power distribution apparatuses such as an electric distribution panel (DP), a distribution panel, and a power distribution panel are respectively installed in a power concentration camp where electric power systems are distributed to distribute electric power to a power consumption system do. To this end, various distribution devices are provided with various switches, breakers, and gauges to perform power switching, switching, safety, and metering.

FIG. 2 is a configuration diagram specifically showing the digital power meter of FIG. 1 according to the first embodiment.

2, the digital power meter PM of the present invention includes a voltage / current input unit 200 for measuring the voltage and current of the power system output through the DC / A memory unit 400 for storing the amount of power and operation parameters detected by the transformer 100, a control unit for controlling the detection operation of the voltage / current input unit 200 according to operation parameters, and recording the amount of power detected in the memory unit 400 And an MCU 300 that is connected to the network.

Transformer / transformer 100 distributes the three-phase voltage (R, S, T) of the power system to the voltage and current of the power system and outputs it to the power system. At this time, the voltage / current input unit 200 measures the voltage and current of the power system output through the transformer / transformer 100 to measure the amount of electricity, and displays various amounts of electricity including the measured amount of electricity.

The memory unit 400 stores operating parameters required for the operations of the voltage / current input unit 200 and the MCU 300 according to pre-programmed execution codes. And information on the amount of power detected by the voltage / current input unit 200 is stored in real time. The memory unit 400 may include at least one non-volatile memory. Usually, one nonvolatile memory is used as the backup memory, but a plurality of nonvolatile memories may be used if necessary. At this time, the nonvolatile memory used is an EEPROM. NVM, NVRAM mask ROM, PROM, and UV-EPROM.

The MCU 300 reads operation parameters from the memory unit 400 and operates according to pre-programmed execution codes, and controls the detection operation of the voltage / current input unit 200. And stores the amount of power detected by the voltage / current input unit 200 in the memory unit 400.

The MCU 300 is operated by receiving operation power of the same voltage level as that of the memory unit 400, and the operation power of the same voltage level is supplied to the memory unit 400 as well. The MCU 300 and the memory unit 400 are connected to a serial interface signal specification (for example, SPI or I2C).

In recent years, the specification of the MCU 300 applied to the electronic circuit is a tendency to guarantee operation even at low consumption power and low operating voltage, so that the operation start voltage of the MCU 300 is generally lower than the operation start voltage of the nonvolatile memory .

Therefore, when the MCU 300 is used in the form of a power supply, when the power supply 500 supplies the operating power, the MCU 300 operates first and the memory 400 operates after the operating power is established On the other hand, when the operation power is interrupted, the memory unit 400 may stop operating first and the MCU 300 may stop operating thereafter.

At this time, in order to prevent the problems that may occur, the MCU 300 maintains the disabled state during the power failure, and when the power is restored, the MCU 300 simultaneously supplies the operating power supplied from the power source unit 500 to the memory unit 400 Take and monitor. When the operation power supplied to the memory unit 400 becomes equal to or greater than a predetermined reference value, the memory unit 400 is programmed to be switched to the enabled state.

Specifically, when the power supply unit 500 receives the same operation power simultaneously with the memory unit 400, the MCU 300 receives an operation to be received together with the memory unit 400 Monitor the voltage level of the power supply. When the voltage level of the operating power being monitored is equal to or higher than a preset reference value, the memory unit 400 is switched to the enabled state. Here, the predetermined reference value may be the operation start voltage level of the memory unit 400. [

When the MCU 300 is in an enabled state, the MCU 300 reads operation parameters from the memory unit 400 and operates according to pre-programmed execution codes, and controls the detection operation of the voltage / current input unit 200. And stores the amount of power detected by the voltage / current input unit 200 in the memory unit 400.

Conversely, when entering the blackout state, the MCU 300 is programmed to be disabled at the same time as the memory unit 400 when the voltage level of the operating power received together with the memory unit 400 becomes less than a preset reference value. When the MCU 300 and the memory unit 400 are operated at the same time according to the start voltage level of the memory unit 400, By starting or stopping, the problem that could be caused by the difference in starting voltage can be solved.

FIG. 3 is a configuration diagram specifically illustrating an operation power supply structure of the MCU, the memory unit, and the power supply unit shown in FIG.

3, the MCU 300 includes an analog-to-digital (A / D) converter 320 for simultaneously receiving an operation power supplied to the memory unit 400 and converting the voltage of the operation power source into a digital signal in real time, An operation power verifying unit 330 for generating and outputting an enable signal when the digital signal is equal to or greater than a digital reference value by comparing the digital signal to a predetermined digital reference value, And a measurement recording unit 310 for controlling the detection operation of the voltage / current input unit 200 and recording the detected amount of power in the memory unit 400. [

The analog-to-digital conversion unit 320 may be built in the MCU 300, or may be separately provided outside the MCU 300. The analog-to-digital converter 310 receives the operation power supplied to the memory unit 400 at the same time regardless of the disabled state of the MCU 300, and converts the voltage of the operation power supply into a digital signal in real time . The digital signal converted in real time according to the voltage level of the operating power is transmitted to the operation power verifying unit 330.

The operation power verifying unit 330 compares the digital signal converted by the analog-to-digital converter 310 in real time with a predetermined digital reference value and supplies an enable signal to the measurement and recording unit 310 when the digital signal is equal to or higher than the digital reference value . Here, the preset digital reference value is a digital signal indicating the operation start voltage level of the memory unit 400. [

The operation power verifying unit 330 compares the digital signal converted in real time with a predetermined digital reference value, and supplies a disable signal to the measurement recording unit 310 when the digital signal becomes less than the digital reference value.

When the enable signal is inputted from the operation power source confirmation unit 330, the measurement record unit 310 reads operation parameters from the memory unit 400 to control the detection operation of the voltage / current input unit 200, And the amount of power detected by the sensor 400 is recorded. On the other hand, when the disable signal is inputted from the operation power verifying unit 330, the measurement record unit 310 is disabled together with the memory unit 400.

FIG. 4 is a graph for explaining an operation power source confirmation driving method of the operation power source confirmation unit shown in FIG. 3;

As shown in FIG. 4, since the start voltage of the MCU 300 may be about 2.0 V, when the operating power is about 2.0 V or more, the analog-to-digital converter 320 and the operation power check Section 330 may be enabled. However, since the start voltage of the memory unit 400 is 2.9 V, the MCU 300 can operate abnormally when the memory unit 400 is disabled.

That is, when the operation power source confirmation unit 330 is enabled and the memory unit 400 is disabled, the operation power source confirmation unit 330 is activated but the memory unit 400 is still disabled, It is impossible to guarantee the integrity even when the user attempts to access the memory unit 400 in the memory 330.

The analog-to-digital converter 320 converts the operation power supplied to the memory unit 400 into a digital signal, and outputs the digital signal converted in real time according to the voltage level of the operation power source to the operation power verifier 330 send.

The operation power verifying unit 330 compares the digital signal converted in real time with a preset digital reference value and keeps the disable state when the digital signal is less than the digital reference value, (310).

The measurement recording unit 310 controls the voltage / current input unit 200 in an enabled state only during a period in which the enable signal is input from the operation power source confirmation unit 330, and performs the measurement recording operation.

Then, when a power failure occurs, the operation power verifying unit 330 is disabled with the memory unit 400 when the digital signal converted in real time is less than the digital reference value, and the measurement recording unit 310 is also disabled .

FIG. 5 is a configuration diagram specifically showing the configuration of the MCU, the memory unit, the power supply unit, and the operation power supply structure according to the second embodiment.

As described above, the memory unit 400 included in the digital power meter PM is an EEPROM. NVM, an NVRAM mask ROM, a PROM, and a UV-EPROM, or a plurality of memories as needed. These, EEPROM. NVM, NVRAM Mask ROM, PROM, UV-EPROM, etc. may be the same or different.

The MCU 300 is connected to the EEPROM included in the memory unit 400. NVM, NVRAM Mask ROM, PROM, and UV-EPROM, and is enabled when it is above the reference value, and can be disabled when it is below the reference value.

If the nonvolatile memory of the memory unit 400 is changed to provide a nonvolatile memory whose operating power is different from that of the previous one, the MCU 300 automatically recognizes the operating power of the newly installed nonvolatile memory and is controllable .

Specifically, since the MCU 300 of the digital power meter PM receives the operation power supplied to each nonvolatile memory, the operation parameters are automatically read even if other nonvolatile memories having different operation power sources are installed, The operating power of the newly installed nonvolatile memory can be recognized.

To this end, as shown in FIG. 5, the MCU 300 of the digital power meter PM is an EEPROM. An analog-to-digital converter (320) for receiving an operating power supplied to each memory of at least one of an NVM, an NVRAM mask ROM, a PROM and a UV-EPROM, An operation power verifying unit 330 for generating and outputting an enable signal when the digital signals converted for each memory are compared with preset digital reference values for each memory, When the enable signal is generated, a measurement record unit 310 that reads operation parameters from the memory unit 400 to control the detection operation of the voltage / current input unit 200 and records the amount of detected power in the memory unit 400 do.

6 is a graph for explaining an operation power source confirmation driving method of the operation power source confirmation unit shown in FIG.

Referring to FIG. 6, the operation power verifying unit 330 compares the converted digital signals for each memory with preset digital reference values for each memory. Then, when any one of the digital signals converted by the memory is smaller than each preset digital reference value, the disable signal is transmitted to the measurement recording unit 310.

However, when the converted digital signals for each memory are equal to or greater than predetermined digital reference values, the enable signal is generated and transmitted to the measurement recording unit 310.

The measurement recording unit 310 controls the voltage / current input unit 200 in an enabled state only during a period in which the enable signal is input from the operation power source confirmation unit 330, and performs the measurement recording operation.

Then, when a power failure occurs, the operation power verifying unit 330 is disabled with the memory unit 400 when the digital signal converted in real time is less than the digital reference value, and the measurement recording unit 310 is also disabled .

As described above, the digital power meter for the switchboard and the distribution board according to the embodiment of the present invention can operate only the MCU 300 and the operating power sources of the memories (specifically, the operation starting power source Even if they are different from each other, the operation can be started or stopped at the same time.

Particularly, the efficiency can be further improved by allowing the MCU 300 and the memories to start or stop at the same time at least by changing the structure without adding additional components.

In addition, even when the MCU 300 and the memories have different operating power sources, operation can be started or stopped at the same point in time, thereby preventing operation errors, providing integrity, and improving reliability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

DP: Switchboard
PM: Digital Power Meter
100: flow / transformer
200: voltage / current input section
300: MCU
310: Measurement log
320: ADC
330: Operation power verifying unit
400:
500:

Claims (7)

A transformer / transformer for measuring the power amount of the power system;
A memory unit for storing a measured amount of power and a preset operating parameter in the transducer / transformer;
And an MCU for controlling the detecting operation of the change-over / transforming unit by the operation parameter and recording the detected amount of electric power in the memory unit,
The MCU
Monitoring the operation power supplied from the power supply unit to the memory unit and switching to the enabled state when the operation power supplied to the memory unit is equal to or greater than a predetermined reference value,
Wherein the predetermined reference value is set to an operation start voltage level of the memory unit and the MCU and the memory unit are simultaneously started when the operation power supply is equal to or greater than a preset reference value,
Digital power meter for switchboard and distribution board.
The method according to claim 1,
The MCU
The power supply unit monitors the operation power supplied from the power supply unit to the memory unit and when the operation power is less than a predetermined reference value,
Digital power meter for switchboard and distribution board.
The method according to claim 1,
The MCU
An analog-to-digital converter for receiving the operating power supplied to the memory unit and converting a voltage of the operating power to a digital signal;
An operation power verification unit for comparing the converted digital signal with a predetermined digital reference value to generate and output an enable signal when the digital signal is equal to or greater than the digital reference value;
And a metrology record unit for reading the operation parameter from the memory unit when the enable signal is generated to control the detection operation of the metamorphosis / metamorphosis unit and recording the detected amount of power in the memory unit
Digital power meter for switchboard and distribution board.
The method of claim 3,
The operation power verifying unit
Comparing the digital signal to be converted with a predetermined digital reference value, generating and outputting a disable signal when the digital signal is less than the digital reference value,
And generates the enable signal and transmits the enable signal to the measurement recording unit when the digital signal to be converted becomes the digital reference value or more
Digital power meter for switchboard and distribution board.
The method according to claim 1,
The memory unit
EEPROM. NVM, an NVRAM mask ROM, a PROM, and a UV-EPROM
Digital power meter for switchboard and distribution board.
6. The method of claim 5,
The MCU
The EEPROM. An analog-to-digital converter converting an operating power of each memory into a digital signal by receiving operating power supplied to each memory of at least one of NVM, NVRAM mask ROM, PROM, and UV-EPROM;
And an operation power source checking unit for comparing the digital signals converted by the memory with the preset digital reference values for each memory and generating and outputting an enable signal when the memory- ;
And a metrology record unit for reading the operation parameter from the memory unit when the enable signal is generated to control the detection operation of the metamorphosis / metamorphosis unit and recording the detected amount of power in the memory unit
Digital power meter for switchboard and distribution board.
The method according to claim 6,
The operation power verifying unit
Comparing the digital signals converted for each memory with preset digital reference values for each memory, and when a digital signal converted for each memory is less than each digital reference value preset for each memory, a disable signal is transmitted to the measurement recording unit and,
And generates the enable signal and transmits the enable signal to the measurement recording unit when the digital signal converted for each memory becomes equal to or greater than each digital reference value preset for each memory
Digital power meter for switchboard and distribution board.

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